Fountain liquid applicator with magnet ring valve seat



June 14, 1960 c. L. HOPKINS 2,940,106

FOUNTAIN LIQUID APPLICATOR-WITH MAGNET RING VALVE SEAT Filed May 27,1958 INVENTOR. CEc/L L. HOPK/NS BY BM, 5W

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4 TTOPA/E Y5 United States Patent FOUNTAIN LIQUID APPLICATOR WITH MAGNETRING VALVE SEAT Cecil L. Hopkins, W. 3428 Walton, Galion, Ohio Filed May27, 1958, Ser. No. 738,209

' I 9 Claims. c1. 15-139) This invention relates to liquid applicatordevices of the type in which a brush or other yieldable liquid applyingelement is stored interiorly of an hermetically sealed container for theliquid, and the container has a discharge opening which is unsealed andthrough which the brush or applying element is projected for use.

In applicators of the character referred to it is desirable to providemeans for holding the brush in projected use position so that the brushis not forced back into the container by the slight endwise pressurewhich is incidental to using the brush in applying the liquid.

In copending application for Patent Serial No. 556,631, filed December30, 1955, on Retractable Brush Applicator with Magnetic Brush Retainer,now Patent 2,849,- 738, dated September 2, 1958, I have disclosed adevice in which a nonmagnetic plastic tubular nozzle body fast on aliquid container defines a passage in which a brush assembly isdisposed, the brush assembly being axially shiftable in the passage bygravitational action between projecteduse position and retracted storageposition. A magnet embedded in the plastic nozzle of the applicatorattracts a magnetic brushessembly to hold the latter in projected useposition against the application to the brush assembly of externalforces of predetermined magnitude tending to move thebrush assembly intoretracted storage position when the device is disposed with the nozzledischarge directed either upwardly or downwardly. The weight of thebrush assembly, when the'device isdisposed with. such discharge directedupwardly and with the brush assembly in projected use position, is suchthat upon movement of the'brush assembly a predetermined distance awayfrom the magnet, the brush assembly is shiftable by gravitational actionfrom use to storage positions. The present invention aimsto improve suchgravity actuated, magnetically controlled applicators. One objecti've isconcerned with the particular shape and position of the magnetic elementin the nonmagnetic nozzle. Such element, as presently conceived,provides a tapered valve seat directly engaged by the brush assembly.More specifically, and as a further objective, such valve seat magneticelement is formed with a tapered surface which delineates the extent ofthe main or relatively large diameter portion of the nozzle throughpassage and of the minor or relatively small diameter discharge portionof such passage which extends from the tapered surface valve seat to thedischarge orifice of the nozzle. Such tapered surface of the magneticelement also serves to engage the end of the tuft carrying element ofthe brush assembly in centering and guiding such tuft carrying elementas the latter is advanced through the valve seat opening in movement ofthe brush assembly to projected use position.

As a specialized feature directed to improvement in the control over thedischarge of liquid, the invention provides the combination of arelatively long tapered discharge passage portion and a brush holdingelement 'ice of the stem which, upon being shifted axially todifi'erentpositions in the discharge passage, modulates the gravity How of liquidout the discharge and onto the brush for use.

The best known mode of practicing the principles of the invention isshown in a preferred embodiment i1- lustrated in the accompanyingdrawings, which 'form part of the specification.

In the drawings:

Figure l is a foreshortened longitudinal sectional view of a gravityactuated, magnetically controlled applicator having a ring magnetembedded in the plastic nozzle of the container as a valve seat and soas to hold the steel brush-carrying stem in projected use position, thisview showing the brush assembly retracted and a s'ealing cap in placeover the discharge outlet of the nozzle;

Fig. 2 is a fragmentary longitudinal sectional detail showing the nozzleend of the applicator in inverted use position with the cap removed andthe brush projected through the discharge outlet and the steel valve endof the brush carrier seated against the embedded magnet;

Fig. 3 is a sectional detail taken transversely through the nozzle inthe plane of the magnet represented by line 3-3 of Fig. 2; and

Fig. 4 is a fragmentary longitudinal sectional detail, similar to Fig.2, but enlarged to show details.

The present invention isof utility in applicators having containers ofvarious shapes and constructions but, for simplicity, is illustrated inconnection with applicators having containers comprising a receptacle 1conveniently formed of aluminum as by drawing into substantiallycylindrical tube shape having a closed end 2 which constitutes a bottomfor the applicator device in the upright or storage position of Fig. 1.The other end of the tubular receptacle receives as by a sealing pressfit the generally cylindrical base end 3 of a tubular nozzle member 4molded of a suitable'no'nmagnetic material such as phenolformaldehyde, aurea resin or a hard plastic composition.

Extending axially through the circular sectioned nozzle body is apassage 5, 6 for the liquid to be applied by the device, which passageaccommodates an axially movable brush assembly comprising a stem and abrush '7. The stem is formed of soft iron or steel having good magneticproperties and may. include a relatively long rod portion 8 of uniformcircular section and a relatively short cylindrical brush holding andvalve portion 9. The end of the brush holding portion is bored axiallyto receive as by a press fit aplastic element 10 in which the brushbristles 7 are embedded. Outer end portion 11 of the nozzle body member4 is tapered and terminates in a discharge opening 12 through which thebrush is projected for use and through which liquid flows onto the brushwhen the device is being used to apply the liquid to the, surface to becovered. a

When the device is not in use the discharge opening 12 is closed by athimblelike cap 14 which is received over the nozzle member 4 and heldin place as by :a threaded joint comprising internal threads in skirtportion 15 of the cap and external threads 16 on the nozzle bodyadjacent the base 3'of the latter. Circular disc 17 of deformableplastic material such as polyethylene is retained in a recess in bottom18 of the closure cap 14 and is engaged by tip end 19 of the nozzle bodyto seal the discharge opening when the closure is tightened in place.

At the juncture of the main and discharge portions 5, 6 of the nozzlepassage a magnet 26 is embedded in the plastic composition or othernonmagnetic material of which the nozzle body 4 is formed. It isadvantageous and economical to form the magnet of circular sectionedmagnetic wire bent to circular or ring shape. The ring -its suitablymagnetized to exhibit a high coercive force.

Spaced ends 30, 31 of the split ring magnet thus provided are polarizednorth and south as indicated in Fig. .3. The

magnet, in the form of a completely annular ring magnetiz'ed axially, aplurality of arcuate segmental magnets Because of the relatively smallsize of the applicator, the circular sectioned nozzle 4 having anexternal diameter of the'order of about A inch, the magnetic element 26is necessarily very small. Thus, a magnet of relatively high coerciveforce is necessary to hold the brush assembly in projected use positionwhen the device is held with the brush 7 directed upwardly in paintingthe underside of an article. In the case of a brush assembly having themain rod portion 8 and brush holding portion 9 of the stem .formed ofcold rolled steel, weighing from about .15 ounce 'to about .25 ounce, acircular split ring magnetized element 26 formed of aluminum-nickel-ironmagnetic wire material of the character referred to and of the order ofabout ,6 inch diameter, provides sufiicient magnetic force to 'hold thebrush assembly in the projected use position with thebrush 7 directedupwardly to permit painting the undersurface of an appliance, article offurniture or a vehicle fender. In a split ring magnet of such size thegap between the poles 30,31 is from about to about A inch.

'In endwise travel of the brush assembly projecting the brush, andlikewise in reverse travel retracting the brush, the rod portion 8 ofthe stem is guided by a flat circular Washer 23 of fiber or plasticpress fitted into an enlarged circular sectioned or counterbored portion24 of the nozzle passage main portion located at the base end 3 of thenozzle. This enlarged passage portion 24 opens axially through the baseend of the nozzle body and constitutes the fluid receiving opening ofthe nozzle. The washer 23 has a loose fit about the stem of the brushassembly, providing an annular clearance through which the liquid flowsfrom the receptacle tube 1 into the interior of the nozzle when theapplicator is inverted. In addition to this annular clearance betweenthe centering washer 23 and the stem of the brush assembly, whichclearance constitutes a metering orifice for regulating the rate of flowof liquid to the main portion 5 of the nozzle passage, the inner marginof the washer may be formed with radial notches 25 that are continuouswith such annular clearance to augment the flow of the liquid in thecase of a relatively viscous material such as lacquer.

. 9. It is preferable that the shoulder 29 be so located on r the stemthat in the retracted position of the brush outer end 33 of the plasticnonmagnetic brush holder is .spaced inwardly of the nozzle beyond thevalve seat surface 27. In thus withdrawing the plastic brush holder 16from the circular opening through the magnet '26, this being the openingthat defines the inner or entrance end of the discharge passage portion6, such inner end opening is relatively unobstructed by the plasticportion 10 of the stem and return flow of liquid from the brush and thedischarge portion 6 of the nozzle passage into the main passage portion5 is facilitated.

When the device is to be used to apply touch-up lacquer or paint to anappliance or automobile body in covering scratches or other surfaceblemishes or marks, the closure cap 14 is first unscrewed and removedfrom the nozzle 4. The device is then inverted or upended to directdownwardly the discharge opening .12 of the nozzle. The brush assemblyin the upended device then drops by gravity to the projected useposition of 'Fig. 2, the rate of dropping depending upon the viscosityof the paint, lacquer or other liquid with which the device is chargedand the quantity of such liquid remaining in the passage portion 5 fromthe preceding use of the device. The limit of axial movement of thebrush assembly in thus projecting the brush for use is determined bydirect engagement of the circular valve edge corner 20 of the magneticelement or brush holding portion 9 of the stem against a valve seatwhich comprises the tapered toroid or arcuately curved metal or metalalloy surface 27 of the magnetic element 26 and a similarly curvedsurface 32 on that portion of the non-magnetic plastic material of thenozzle body which fills the space between the pole ends 30, 31 of themagnet. Such direct metal-to-metal contact between the magnetic elementsof the nozzle and the stem obtains magnetic forces of high efiiciency tohold the parts together and to retain the brush in the projected useposition. In the case of the split ring magnet shown, the metal of thestem portion 9 bridges the gap and constitutes an armature between thenorth-south magnetic poles.

Another advantage of the arcuately curved surface 27 V of the magneticelement 26 is that such surface guides and centers forward or outer end33 of the plasticbrush holder 10 of the stem when the latter is advancedinto the relatively small discharge portion 6 of the nozzle passage fromthe larger main passage portion 5 in projecting the brush for use.

After the outer end 33 of the plastic brush holder 10 of the stem entersthe discharge portion 6 of the nozzle passage in shifting the brushassembly from storage to use position, engagement of the stem end 33against the tapered wall of the passage further and progressivelycenters the stem on the axis of the nozzle with the result that thevalve edge corner 20 engages the valve seat 27 within a relativelynarrow predetermined circular zone.

At the projected limit of movement of the stem the extreme outer end ofthe plastic brush holder portion 10 is located in the discharge opening12 substantially but not completely closing the latter and stabilizedagainst lateral displacement in painting by engagement with the walls ofthe opening.

The bristles of the brush tuft 7 are sufficiently stiff so that whenusing the device with the nozzle directed downwardly and more paint orlacquer is wanted on the brush, endwise or axial pressure can be appliedby pressing the bristles against the surface being painted to overcomethe forces of gravity and magnetic attract-ion holding the valve edge 20against the magnetic surface 27 of the valve seat, thereby allowingliquid to flow into the discharge portion 6 of the passage from the mainpassage portion 5. Since the discharge passage 6 tapers or decreases incross sectional area from the valve seat to the discharge opening 12,the area of an annular orifice defined by the tapered wall of thepassage and the circular end 33 of the stem portion 10 can be varied byshifting the stem axially relative to the nozzle. The more the operatorretracts the stem into the nozzle by endwise pressure on the brush, thegreater is the area of the annular discharge orifice about the stem end33. When the desired charge of liquid has been received on the brush,the operator :lets up on the endwise pressure, allowing the brushassembly to return by gravity and magnetic force to the fullyprojected'use position in which the discharge portion 6 of the nozzlepassage is sealed from the main portion 5 by the engagement of the valveedge 20 against the seat.

The clearance about or fit of the outer end 33 of the stem within thedischarge opening 12 of the nozzle depends upon the viscosity of theliquid intended to be dispensed by the device. In the case of a thinliquid such as a stain, the fit is relatively close, sufficient toprevent flooding when the valve edge 20 is displaced from the seat 27 inuse and as described above. In the case of a relatively thick or highlyviscous liquid such as a pigmented paint or lacquer, the fit isrelatively loose, the periphery of the stem end 33 being separated fromthe wall of the discharge opening 12 by an annular clearance even whenthe stem is fully projected in use. The useful feature of thearrangement described is that the area of the annular discharge orificeis varied in proportion to the axial displacement of the stem so thatthe user readily modulates the flow of the replenishing charge of liquidonto the brush and, when the desired charge is obtained, shuts off theflow from the main passage 5 by allowing the valve edge corner 20 toseat against the magnet.

After using the device the brush assembly is retracted, the device, ifin use in the nozzle down position, being first upended so that thedischarge opening 12 is directed upwardly. Retraction of the brushassembly to the storage position of Fig. 1 is effected by gravity afterfirst disengaging the magnetic portion or element 9 of the stem from themagnet 26 suificiently to overcome the magnetic force that holds theparts together. For example, in an applicator proportioned as shown inthe drawings, having parts as described above, a valve seat magnet and astem of the size and weight mentioned, the magnetic force is overcomeand the brush assembly drops by' gravity in the upended device when thevalve edge corner2tl is displaced axially from about & inch to about Myinch from the magnet 26, this being less than A of the total travel ofthe brush assembly between its limits of movement; An optimumdisplacement for freeing the stem in the upended position is of theorder of about inch in such an applicator.

Such endwise displacement of the stem to dislodge it from the magnet andallow it to gravitate to storage. position is readily effected by anendwise tap against the bottom 2 of the container 'or by endwisepressure on the projecting brush.

The discharge portion 6 of the nozzle passage, which has a length atleast about twice, preferably three times "its minimum diameter, is ofmuch less cross sectional area than the'main passage portion 5 and isslightly tapered toward the discharge opening'lZ at its'forward end.Thus the walls of the discharge passage portion 6 closely'confine, shapetogether and straighten the bristles or hairs of the brush tuft-7 whenthe latter is retracted to 'the storage position of Fig. .1 so that thenext time the brush is projected for use it emerges from the nozzle inthey desired straight compact condition.

The tip end w of the nozzle 4 is spaced axially beyond the dischargeopening 12, the end of the nozzle being formed with a tapered orfrusto-conical mouth or cup 34 that extends outwardly beyond thedischarge opening and terminated the nozzle passage. In the upendedstorage position of the device the mouth 34 provides a receptacle thatretains liquid wiped off therbristles of the brush 7 as the latterretracts to the storage position. As

shown in Fig; l the brush tuft 7 is of such length, /2 inch in theapplicator described, that the brush is drawn completely into thedischarge portion 6 of the nozzle passage to completely clear the mouth34. Thus paint or lacj quer wiped off the descending brush settles downin the tapered mouth and follows the brush tuft into the dis- :chargeportion of the passage suificiently to eliminate overflowing of the endcap 34 when the cap 14 is applied 'fsealingly against the nozzle end 19.

""" The axial extent of the magnetic element 9 of th tern is terminatedatthe valveedge corner 20 although non-magnetic portions of the stemcomprising the plastic brush holder 10 and the brush tuft 7 extendforward from the valve seat 27 through and beyond the discharge opening12. The lines of magnetic force between the magnet 26 and the stern arethus concentrated in that part of the stem which lies inwardly of thevalve seat, this feature obtaining maximum magnetic attraction betweenthe parts and permitting the use of a ring magnet 26 of relatively smallsize. 7

To embed the magnet 26 in the desired predetermined location during themolding of the plastic tubular nozzle body 4, the magnet is mounted onthe core of the mold, the latter being formed with a circumferentiallyextending shoulder that matches the toroid shape of the surface 27 ofthe magnet ring 26 so that the magnet ring is readily located inpredetermined position on the core before the latter is inserted intothe mold. The circumferential shoulder on the molding core is completelycircular in extent to allow the plastic material to flow and bridge thegap between the magnet poles or ends 30, 31.

The present invention thus provides a specialized improvement in aliquid applicator of the type in which an assembly comprising anelongated stem and a brush tuft or equivalent deformable applicator onone end of the stem is actuated by gravity for axial movement in thelongitudinal through passage of a tubular dispensing nozzle, the brushassembly being shiftable between a use position in which the brushprojects from the discharge opening of the nozzle at one end of thepassage and a normal storage position in which the brush is retractedwholly Within the passage. The improvement comprises the combination ofa non-magnetic nozzle body, a magnetic element carried by and as a partof the brush assembly and a magnetic element embedded in the body toprovide a magnetic valve seat that divides the nozzle passage into mainand discharge portions and provides a tapering surface directly engagedby a circular edge corner of a valve portion of the brush assemblymagnetic element to seal the nozzle passage.

The direct contact between the magnetic elements, one being magnetized,results in optimum magnetic 'efliciency and the tapered shape of theexposed surface of the magnetic valve seat aids in automatic centeringof the valve to the best sealing position relative to the seat.Additional features relating to centering of the brush assembly andmodulation of the liquid flow in use also characterize the invention.

In accordance with the patent statutes the principles of the presentinvention may be utilized in various ways, numerous modifications andalterations being contemplated, substitution of parts and changes inconstruction being resorted to as desired, it being understood that theembodiment shown in the drawings and described above is given merely forpurpose of explanation and illustration without intending to limit thescope of the claims to the specific details disclosed.

What I claim and desire to secure by Letters Patent of the UnitedStates, limited only to the extent required by law, is:

1. A liquid applicator device comprising a hollow container having anelongated nonmagnetic tubular nozzle with base and tip ends,asubstantially annular magnetic element secured within the nozzle at apoint spaced from both ends, said element dividing the interior of thenozzle into and defining an axial valve opening between a main passageportion which extends to and opens axially through the base end and adischarge passage portion having an axial length at least twice itsminimum transversedirnension which extends to and opens axially throughthe tip end; a brush assembly extending axially in the passage portions,said assembly comprising a stem including a and extending axiallythemfrom; the assembly being shiftable axially in the nozzle between useand storage posi- 'tions, the 'valve element engaging the annularmagnetic element to locate the'assernbly axially, the holder extendingthrough and being substantially coextensive in length with the dischargepassage portion, and the brush project- "ing axially throughthedischarge opening in the use position; the valve surface being spacedtoward the base end from the annular element, the entire length of theholder being withdrawn from the discharge passage portion and locatedwholly in the main passage portion and the brush being wholly retractedinto-the nozzle in said storage position; the major portion of the axiallength of the brush being disposed in and closely surrounded by the wallof the discharge passage portion in said storage position to compact,straighten and mold to shape the brush tuft upon each retraction; saidannular element having a tapered seat surf-ace directly engaged by thecircular surface'of the valve element in the use position to seal thepassage portions from one another, one of said magnetic elements beingmagnetized to influence the other, said assembly being shiftable fromstorage to use positions by gravity when the device is disposed with thedischarge openingdirected downwardly, the magnetic force between thedirectly engaged elements holding the assembly in the use positionagainst external forces of predetermined magnitude imposed on theassembly tending to move the latter to the storage position when thedevice is disposed With the discharge opening directed either upwardlyor downwardly, the weight of the assembly, when the device is disposedwith the discharge opening directed upwardly and with the assembly inuse position being such that when the surface of the valve element ismoved a predetermined distance from the seat surface of the annularelement, the assembly is shiftable by gravitational action from said useposition to said storage position, the stem throughout its length withinthe nozzle being of less cross-sectional area than the main passageportion to provide an annular clearance for liquid, and the nonmagneticholder being engageable with the tapered seat surface to guide suchholder through the valve opening and with the wall of the dischargepassage portion to center the assembly on the nozzle axis as themagnetic valve element moves into engagement with the annular magneticelement in the shifting of the assembly from storage to use positions.

2. An applicator device as in claim 1 in which the discharge passageportion'and said other end of the brush holder are of similar crosssectional shape and such dischargepassage portion tapers toward thedischarge opening, the wallof the passage and the periphery of saidother end of the holder defining an annular liquid discharge orificesurrounding the holder in the use position and variablein areauponaxialmovement of the brush assem- -b'ly in the nozzle -to modulategravitational flow of liquid onto the projected brush from the nozzle.

3. A liquid dispensing and applying device of the retractable applicatortype comprising a hollow container having a nonmagnetic tubulardispensing nozzle, said "nozzle being formed with an axial passagethrough which liquid-is 'dispended from the interior of the container,saidpassage having an inner-end in communication with the interior ofthe container and an outer end discharge open'ing, an applicatorassembly disposed in the nozzle passage,-said assemblycomprising a stemincluding a magarctic-metal element formed with a circular valvesurface, 'asubstantially circular-torus shaped magnetic metal elementpartially embedded in the nonmagnetic nozzle and having a substantiallycircular toroidally curved valve 'seat 'sur-face portion exposed in thenozzle passage at a point spaced inwardly from the discharge opening,one ot said-magnetic elements being magnetized to influence the mtherthe circular valve surface on the metal element :of the stem beingadapted to make direct metal to metal substantially circular contactwith the toroidal valve seat surface portion of the partially embeddedmetal element substantially to seal the nozzle pass-age, a deformableapplicator fast to one end of and aligned with the stem, the applicatorassembly being shiftable axially in the nozzle passage between a useposition in which the valve surface and the valve seat are magneticallyheld together in effecting said seal of the nozzle passage with thedeformable applicator projecting from the discharge opening and a normalstorage position in which the valve surface is withdrawn from the valveseat and the deformable applicator is retracted wholly within the nozzlepassage, the applicator assembly being shiftable from said storageposition by gravitational action on said assembly when the device isdisposed with the discharge opening facing downwardly, the magneticforce between the directly contacting metal elements tending to .holdthe applicator in said use position against external forces ofpredetermined magnitude imposed on the applicator assembly tending .tomove the latter to said storage position when the device is disposedwith said discharge opening facing either upwardly or downwardly, andthe weight of the applicator assembly, when the device is disposed withsaid discharge opening facing upwardly and with the applicator assemblyin use position being such that when the magnetic element of theapplicator assembly is moved a predetermined distance from the magneticelement embedded in the nozzle, the applicator assembly is shiftable bygravitational action from said use position into said storage position.

4. An applicator device as claimed in claim 1 in which the annularmagnetic element is magnetized and in the form of a split ring havingspaced confronting ends constituting poles.

5. An applicator device as claimed in claim 4 in which an integralportion of the nonmagnetic nozzle is disposed between the pole ends ofthe annular element and has a surface flush with the tapered seatsurface of the annular element.

6. An applicator device as claimed in claim 1 in which the annularmagnetic element comprises a magnetized split ring of circular sectionembedded in the nozzle and having a toroidal surface a major portion ofwhich is covered by the material of the nozzle and a minor portion ofwhich constitutes the tapered valve seat surface.

7. A device as claimed in claim 3 in which the circular magnetic elementcomprises a split ring magnet having spaced ends constituting its poles.

8. A device as claimed in claim 3 in which the major portion of thesurface of the circular magnetic element embedded in and covered by thematerial of the nozzle ody.

9. A liquid applying device comprising a hollow container having anonmagnetic tubular dispensing nozzle, said nozzle being formed with anaxial passage through which liquid is dispensed from the interior of thecontainer, said passage having an inner end in communication with theinterior of the container and an outer end discharge-opening, anapplicator assembly disposed in the nozzle passage, said assemblycomprising a stem including a magnetic element formed with a circularvalve surface, asubstantially circular split ring magnet embedded in thenonmagnetic nozzle and having a substantially circular valve seatsurface portion exposed in the nozzle passage at a point spaced inwardlyfrom the discharge opening, the circular valve surface on the stemelement being adapted to make direct metal to metal substantiallycircular contact with the valve seat surface portion of the embeddedring magnet substantially to seal the nozzle passage, a deformableapplicator fast to one end of and aligned with the stem, the applicatorassembly being shiftable axially in the nozzle passage between a useposition in which the valve surface and the valve seat are magneticallyheld together in effecting said seal of the nozzle passage with thedeformable applicator pro- ;jeoting :from the discharge opening and a.normal storage Q position in which the valve surface is withdrawn fromthe valve seat and the deformable applicator is retracted wholly withinthe nozzle passage, the applicator assembly being s'hiftable from saidstorage position by gravitational action on said assembly when thedevice is disposed with the discharge opening facing downwardly, themagnetic force between the directly contacting stern element and ringmagnet holding the applicator in said use position against externalforces of predetermined magnitude imposed on the applicator assemblytending .to move the latter to said storage position when the device isdisposed with said discharge opening facing either upwardly ordownwardly, and the weight of the applicator 10 assembly, when thedevice is disposed with said discharge opening facing upwardly and withthe applicator assembly in use position being such that when themagnetic element of the applicator assembly is moved a predetermineddistance from the ring magnet surface, the applicator assembly isshiftable by gravitational action from said use position into saidstorage position.

References Cited in the file of this patent UNITED STATES PATENTS2,485,494 Jockers Oct. 18, 1949 2,847,690 Edelstone et al Aug. 19, 1958-2,849,738 Hopkins Sept. 2, 1958

